Commit | Line | Data |
---|---|---|
2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * Anycast support for IPv6 | |
1ab1457c | 4 | * Linux INET6 implementation |
1da177e4 LT |
5 | * |
6 | * Authors: | |
7 | * David L Stevens (dlstevens@us.ibm.com) | |
8 | * | |
9 | * based heavily on net/ipv6/mcast.c | |
1da177e4 LT |
10 | */ |
11 | ||
4fc268d2 | 12 | #include <linux/capability.h> |
1da177e4 LT |
13 | #include <linux/module.h> |
14 | #include <linux/errno.h> | |
15 | #include <linux/types.h> | |
16 | #include <linux/random.h> | |
17 | #include <linux/string.h> | |
18 | #include <linux/socket.h> | |
19 | #include <linux/sockios.h> | |
1da177e4 LT |
20 | #include <linux/net.h> |
21 | #include <linux/in6.h> | |
22 | #include <linux/netdevice.h> | |
23 | #include <linux/if_arp.h> | |
24 | #include <linux/route.h> | |
25 | #include <linux/init.h> | |
26 | #include <linux/proc_fs.h> | |
27 | #include <linux/seq_file.h> | |
5a0e3ad6 | 28 | #include <linux/slab.h> |
1da177e4 | 29 | |
457c4cbc | 30 | #include <net/net_namespace.h> |
1da177e4 LT |
31 | #include <net/sock.h> |
32 | #include <net/snmp.h> | |
33 | ||
34 | #include <net/ipv6.h> | |
35 | #include <net/protocol.h> | |
36 | #include <net/if_inet6.h> | |
37 | #include <net/ndisc.h> | |
38 | #include <net/addrconf.h> | |
39 | #include <net/ip6_route.h> | |
40 | ||
41 | #include <net/checksum.h> | |
42 | ||
2384d025 JB |
43 | #define IN6_ADDR_HSIZE_SHIFT 8 |
44 | #define IN6_ADDR_HSIZE BIT(IN6_ADDR_HSIZE_SHIFT) | |
45 | /* anycast address hash table | |
46 | */ | |
47 | static struct hlist_head inet6_acaddr_lst[IN6_ADDR_HSIZE]; | |
48 | static DEFINE_SPINLOCK(acaddr_hash_lock); | |
49 | ||
b71d1d42 | 50 | static int ipv6_dev_ac_dec(struct net_device *dev, const struct in6_addr *addr); |
1da177e4 | 51 | |
2384d025 JB |
52 | static u32 inet6_acaddr_hash(struct net *net, const struct in6_addr *addr) |
53 | { | |
54 | u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net); | |
55 | ||
56 | return hash_32(val, IN6_ADDR_HSIZE_SHIFT); | |
57 | } | |
58 | ||
1da177e4 LT |
59 | /* |
60 | * socket join an anycast group | |
61 | */ | |
62 | ||
b71d1d42 | 63 | int ipv6_sock_ac_join(struct sock *sk, int ifindex, const struct in6_addr *addr) |
1da177e4 LT |
64 | { |
65 | struct ipv6_pinfo *np = inet6_sk(sk); | |
66 | struct net_device *dev = NULL; | |
67 | struct inet6_dev *idev; | |
68 | struct ipv6_ac_socklist *pac; | |
6ab57e7e | 69 | struct net *net = sock_net(sk); |
53b7997f | 70 | int ishost = !net->ipv6.devconf_all->forwarding; |
1da177e4 LT |
71 | int err = 0; |
72 | ||
c4a6853d MRL |
73 | ASSERT_RTNL(); |
74 | ||
af31f412 | 75 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
76 | return -EPERM; |
77 | if (ipv6_addr_is_multicast(addr)) | |
78 | return -EINVAL; | |
232378e8 DA |
79 | |
80 | if (ifindex) | |
81 | dev = __dev_get_by_index(net, ifindex); | |
82 | ||
83 | if (ipv6_chk_addr_and_flags(net, addr, dev, true, 0, IFA_F_TENTATIVE)) | |
1da177e4 LT |
84 | return -EINVAL; |
85 | ||
86 | pac = sock_kmalloc(sk, sizeof(struct ipv6_ac_socklist), GFP_KERNEL); | |
63159f29 | 87 | if (!pac) |
1da177e4 LT |
88 | return -ENOMEM; |
89 | pac->acl_next = NULL; | |
4e3fd7a0 | 90 | pac->acl_addr = *addr; |
1da177e4 LT |
91 | |
92 | if (ifindex == 0) { | |
93 | struct rt6_info *rt; | |
94 | ||
b75cc8f9 | 95 | rt = rt6_lookup(net, addr, NULL, 0, NULL, 0); |
1da177e4 | 96 | if (rt) { |
d1918542 | 97 | dev = rt->dst.dev; |
94e187c0 | 98 | ip6_rt_put(rt); |
1da177e4 LT |
99 | } else if (ishost) { |
100 | err = -EADDRNOTAVAIL; | |
bb69ae04 | 101 | goto error; |
1da177e4 LT |
102 | } else { |
103 | /* router, no matching interface: just pick one */ | |
6c555490 WC |
104 | dev = __dev_get_by_flags(net, IFF_UP, |
105 | IFF_UP | IFF_LOOPBACK); | |
1da177e4 | 106 | } |
232378e8 | 107 | } |
1da177e4 | 108 | |
63159f29 | 109 | if (!dev) { |
1da177e4 | 110 | err = -ENODEV; |
bb69ae04 | 111 | goto error; |
1da177e4 LT |
112 | } |
113 | ||
bb69ae04 | 114 | idev = __in6_dev_get(dev); |
1da177e4 LT |
115 | if (!idev) { |
116 | if (ifindex) | |
117 | err = -ENODEV; | |
118 | else | |
119 | err = -EADDRNOTAVAIL; | |
bb69ae04 | 120 | goto error; |
1da177e4 LT |
121 | } |
122 | /* reset ishost, now that we have a specific device */ | |
123 | ishost = !idev->cnf.forwarding; | |
1da177e4 LT |
124 | |
125 | pac->acl_ifindex = dev->ifindex; | |
126 | ||
127 | /* XXX | |
128 | * For hosts, allow link-local or matching prefix anycasts. | |
129 | * This obviates the need for propagating anycast routes while | |
130 | * still allowing some non-router anycast participation. | |
131 | */ | |
52eeeb84 | 132 | if (!ipv6_chk_prefix(addr, dev)) { |
1da177e4 LT |
133 | if (ishost) |
134 | err = -EADDRNOTAVAIL; | |
135 | if (err) | |
bb69ae04 | 136 | goto error; |
1da177e4 LT |
137 | } |
138 | ||
013b4d90 | 139 | err = __ipv6_dev_ac_inc(idev, addr); |
bb69ae04 | 140 | if (!err) { |
bb69ae04 ED |
141 | pac->acl_next = np->ipv6_ac_list; |
142 | np->ipv6_ac_list = pac; | |
bb69ae04 ED |
143 | pac = NULL; |
144 | } | |
1da177e4 | 145 | |
bb69ae04 | 146 | error: |
bb69ae04 ED |
147 | if (pac) |
148 | sock_kfree_s(sk, pac, sizeof(*pac)); | |
1da177e4 LT |
149 | return err; |
150 | } | |
151 | ||
152 | /* | |
153 | * socket leave an anycast group | |
154 | */ | |
b71d1d42 | 155 | int ipv6_sock_ac_drop(struct sock *sk, int ifindex, const struct in6_addr *addr) |
1da177e4 LT |
156 | { |
157 | struct ipv6_pinfo *np = inet6_sk(sk); | |
158 | struct net_device *dev; | |
159 | struct ipv6_ac_socklist *pac, *prev_pac; | |
6ab57e7e | 160 | struct net *net = sock_net(sk); |
1da177e4 | 161 | |
c4a6853d MRL |
162 | ASSERT_RTNL(); |
163 | ||
1da177e4 LT |
164 | prev_pac = NULL; |
165 | for (pac = np->ipv6_ac_list; pac; pac = pac->acl_next) { | |
166 | if ((ifindex == 0 || pac->acl_ifindex == ifindex) && | |
167 | ipv6_addr_equal(&pac->acl_addr, addr)) | |
168 | break; | |
169 | prev_pac = pac; | |
170 | } | |
c4a6853d | 171 | if (!pac) |
1da177e4 | 172 | return -ENOENT; |
1da177e4 LT |
173 | if (prev_pac) |
174 | prev_pac->acl_next = pac->acl_next; | |
175 | else | |
176 | np->ipv6_ac_list = pac->acl_next; | |
177 | ||
6c555490 | 178 | dev = __dev_get_by_index(net, pac->acl_ifindex); |
bb69ae04 | 179 | if (dev) |
1da177e4 | 180 | ipv6_dev_ac_dec(dev, &pac->acl_addr); |
bb69ae04 | 181 | |
1da177e4 LT |
182 | sock_kfree_s(sk, pac, sizeof(*pac)); |
183 | return 0; | |
184 | } | |
185 | ||
8c0de6e9 | 186 | void __ipv6_sock_ac_close(struct sock *sk) |
1da177e4 LT |
187 | { |
188 | struct ipv6_pinfo *np = inet6_sk(sk); | |
189 | struct net_device *dev = NULL; | |
190 | struct ipv6_ac_socklist *pac; | |
6ab57e7e | 191 | struct net *net = sock_net(sk); |
1da177e4 LT |
192 | int prev_index; |
193 | ||
8c0de6e9 | 194 | ASSERT_RTNL(); |
1da177e4 LT |
195 | pac = np->ipv6_ac_list; |
196 | np->ipv6_ac_list = NULL; | |
1da177e4 LT |
197 | |
198 | prev_index = 0; | |
199 | while (pac) { | |
200 | struct ipv6_ac_socklist *next = pac->acl_next; | |
201 | ||
202 | if (pac->acl_ifindex != prev_index) { | |
6c555490 | 203 | dev = __dev_get_by_index(net, pac->acl_ifindex); |
1da177e4 LT |
204 | prev_index = pac->acl_ifindex; |
205 | } | |
206 | if (dev) | |
207 | ipv6_dev_ac_dec(dev, &pac->acl_addr); | |
208 | sock_kfree_s(sk, pac, sizeof(*pac)); | |
209 | pac = next; | |
210 | } | |
8c0de6e9 CW |
211 | } |
212 | ||
213 | void ipv6_sock_ac_close(struct sock *sk) | |
214 | { | |
215 | struct ipv6_pinfo *np = inet6_sk(sk); | |
216 | ||
217 | if (!np->ipv6_ac_list) | |
218 | return; | |
219 | rtnl_lock(); | |
220 | __ipv6_sock_ac_close(sk); | |
a9ed4a29 | 221 | rtnl_unlock(); |
1da177e4 LT |
222 | } |
223 | ||
2384d025 JB |
224 | static void ipv6_add_acaddr_hash(struct net *net, struct ifacaddr6 *aca) |
225 | { | |
226 | unsigned int hash = inet6_acaddr_hash(net, &aca->aca_addr); | |
227 | ||
228 | spin_lock(&acaddr_hash_lock); | |
229 | hlist_add_head_rcu(&aca->aca_addr_lst, &inet6_acaddr_lst[hash]); | |
230 | spin_unlock(&acaddr_hash_lock); | |
231 | } | |
232 | ||
233 | static void ipv6_del_acaddr_hash(struct ifacaddr6 *aca) | |
234 | { | |
235 | spin_lock(&acaddr_hash_lock); | |
236 | hlist_del_init_rcu(&aca->aca_addr_lst); | |
237 | spin_unlock(&acaddr_hash_lock); | |
238 | } | |
239 | ||
83aa29ee WC |
240 | static void aca_get(struct ifacaddr6 *aca) |
241 | { | |
affa78bc | 242 | refcount_inc(&aca->aca_refcnt); |
83aa29ee WC |
243 | } |
244 | ||
2384d025 JB |
245 | static void aca_free_rcu(struct rcu_head *h) |
246 | { | |
247 | struct ifacaddr6 *aca = container_of(h, struct ifacaddr6, rcu); | |
248 | ||
249 | fib6_info_release(aca->aca_rt); | |
250 | kfree(aca); | |
251 | } | |
252 | ||
1da177e4 LT |
253 | static void aca_put(struct ifacaddr6 *ac) |
254 | { | |
affa78bc | 255 | if (refcount_dec_and_test(&ac->aca_refcnt)) { |
2384d025 | 256 | call_rcu(&ac->rcu, aca_free_rcu); |
1da177e4 LT |
257 | } |
258 | } | |
259 | ||
93c2fb25 | 260 | static struct ifacaddr6 *aca_alloc(struct fib6_info *f6i, |
83aa29ee WC |
261 | const struct in6_addr *addr) |
262 | { | |
83aa29ee WC |
263 | struct ifacaddr6 *aca; |
264 | ||
265 | aca = kzalloc(sizeof(*aca), GFP_ATOMIC); | |
63159f29 | 266 | if (!aca) |
83aa29ee WC |
267 | return NULL; |
268 | ||
269 | aca->aca_addr = *addr; | |
93c2fb25 DA |
270 | fib6_info_hold(f6i); |
271 | aca->aca_rt = f6i; | |
2384d025 | 272 | INIT_HLIST_NODE(&aca->aca_addr_lst); |
83aa29ee WC |
273 | aca->aca_users = 1; |
274 | /* aca_tstamp should be updated upon changes */ | |
275 | aca->aca_cstamp = aca->aca_tstamp = jiffies; | |
affa78bc | 276 | refcount_set(&aca->aca_refcnt, 1); |
83aa29ee WC |
277 | |
278 | return aca; | |
279 | } | |
280 | ||
1da177e4 LT |
281 | /* |
282 | * device anycast group inc (add if not found) | |
283 | */ | |
013b4d90 | 284 | int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr) |
1da177e4 LT |
285 | { |
286 | struct ifacaddr6 *aca; | |
360a9887 | 287 | struct fib6_info *f6i; |
afb1d4b5 | 288 | struct net *net; |
1da177e4 LT |
289 | int err; |
290 | ||
a9ed4a29 SD |
291 | ASSERT_RTNL(); |
292 | ||
1da177e4 LT |
293 | write_lock_bh(&idev->lock); |
294 | if (idev->dead) { | |
295 | err = -ENODEV; | |
296 | goto out; | |
297 | } | |
298 | ||
299 | for (aca = idev->ac_list; aca; aca = aca->aca_next) { | |
300 | if (ipv6_addr_equal(&aca->aca_addr, addr)) { | |
301 | aca->aca_users++; | |
302 | err = 0; | |
303 | goto out; | |
304 | } | |
305 | } | |
306 | ||
afb1d4b5 | 307 | net = dev_net(idev->dev); |
360a9887 DA |
308 | f6i = addrconf_f6i_alloc(net, idev, addr, true, GFP_ATOMIC); |
309 | if (IS_ERR(f6i)) { | |
310 | err = PTR_ERR(f6i); | |
1da177e4 LT |
311 | goto out; |
312 | } | |
360a9887 | 313 | aca = aca_alloc(f6i, addr); |
63159f29 | 314 | if (!aca) { |
360a9887 | 315 | fib6_info_release(f6i); |
83aa29ee WC |
316 | err = -ENOMEM; |
317 | goto out; | |
318 | } | |
1da177e4 LT |
319 | |
320 | aca->aca_next = idev->ac_list; | |
321 | idev->ac_list = aca; | |
83aa29ee WC |
322 | |
323 | /* Hold this for addrconf_join_solict() below before we unlock, | |
324 | * it is already exposed via idev->ac_list. | |
325 | */ | |
326 | aca_get(aca); | |
1da177e4 LT |
327 | write_unlock_bh(&idev->lock); |
328 | ||
2384d025 JB |
329 | ipv6_add_acaddr_hash(net, aca); |
330 | ||
360a9887 | 331 | ip6_ins_rt(net, f6i); |
1da177e4 | 332 | |
013b4d90 | 333 | addrconf_join_solict(idev->dev, &aca->aca_addr); |
1da177e4 LT |
334 | |
335 | aca_put(aca); | |
336 | return 0; | |
337 | out: | |
338 | write_unlock_bh(&idev->lock); | |
1da177e4 LT |
339 | return err; |
340 | } | |
341 | ||
342 | /* | |
343 | * device anycast group decrement | |
344 | */ | |
b71d1d42 | 345 | int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr) |
1da177e4 LT |
346 | { |
347 | struct ifacaddr6 *aca, *prev_aca; | |
348 | ||
a9ed4a29 SD |
349 | ASSERT_RTNL(); |
350 | ||
1da177e4 LT |
351 | write_lock_bh(&idev->lock); |
352 | prev_aca = NULL; | |
353 | for (aca = idev->ac_list; aca; aca = aca->aca_next) { | |
354 | if (ipv6_addr_equal(&aca->aca_addr, addr)) | |
355 | break; | |
356 | prev_aca = aca; | |
357 | } | |
358 | if (!aca) { | |
359 | write_unlock_bh(&idev->lock); | |
360 | return -ENOENT; | |
361 | } | |
362 | if (--aca->aca_users > 0) { | |
363 | write_unlock_bh(&idev->lock); | |
364 | return 0; | |
365 | } | |
366 | if (prev_aca) | |
367 | prev_aca->aca_next = aca->aca_next; | |
368 | else | |
369 | idev->ac_list = aca->aca_next; | |
370 | write_unlock_bh(&idev->lock); | |
2384d025 | 371 | ipv6_del_acaddr_hash(aca); |
1da177e4 LT |
372 | addrconf_leave_solict(idev, &aca->aca_addr); |
373 | ||
11dd74b3 | 374 | ip6_del_rt(dev_net(idev->dev), aca->aca_rt, false); |
1da177e4 LT |
375 | |
376 | aca_put(aca); | |
377 | return 0; | |
378 | } | |
379 | ||
6c555490 | 380 | /* called with rtnl_lock() */ |
b71d1d42 | 381 | static int ipv6_dev_ac_dec(struct net_device *dev, const struct in6_addr *addr) |
1da177e4 | 382 | { |
bb69ae04 ED |
383 | struct inet6_dev *idev = __in6_dev_get(dev); |
384 | ||
63159f29 | 385 | if (!idev) |
1da177e4 | 386 | return -ENODEV; |
bb69ae04 | 387 | return __ipv6_dev_ac_dec(idev, addr); |
1da177e4 | 388 | } |
1ab1457c | 389 | |
381f4dca SD |
390 | void ipv6_ac_destroy_dev(struct inet6_dev *idev) |
391 | { | |
392 | struct ifacaddr6 *aca; | |
393 | ||
394 | write_lock_bh(&idev->lock); | |
395 | while ((aca = idev->ac_list) != NULL) { | |
396 | idev->ac_list = aca->aca_next; | |
397 | write_unlock_bh(&idev->lock); | |
398 | ||
2384d025 JB |
399 | ipv6_del_acaddr_hash(aca); |
400 | ||
381f4dca SD |
401 | addrconf_leave_solict(idev, &aca->aca_addr); |
402 | ||
11dd74b3 | 403 | ip6_del_rt(dev_net(idev->dev), aca->aca_rt, false); |
381f4dca SD |
404 | |
405 | aca_put(aca); | |
406 | ||
407 | write_lock_bh(&idev->lock); | |
408 | } | |
409 | write_unlock_bh(&idev->lock); | |
410 | } | |
411 | ||
1da177e4 LT |
412 | /* |
413 | * check if the interface has this anycast address | |
bb69ae04 | 414 | * called with rcu_read_lock() |
1da177e4 | 415 | */ |
a50feda5 | 416 | static bool ipv6_chk_acast_dev(struct net_device *dev, const struct in6_addr *addr) |
1da177e4 LT |
417 | { |
418 | struct inet6_dev *idev; | |
419 | struct ifacaddr6 *aca; | |
420 | ||
bb69ae04 | 421 | idev = __in6_dev_get(dev); |
1da177e4 LT |
422 | if (idev) { |
423 | read_lock_bh(&idev->lock); | |
424 | for (aca = idev->ac_list; aca; aca = aca->aca_next) | |
425 | if (ipv6_addr_equal(&aca->aca_addr, addr)) | |
426 | break; | |
427 | read_unlock_bh(&idev->lock); | |
cfcabdcc | 428 | return aca != NULL; |
1da177e4 | 429 | } |
a50feda5 | 430 | return false; |
1da177e4 LT |
431 | } |
432 | ||
433 | /* | |
434 | * check if given interface (or any, if dev==0) has this anycast address | |
435 | */ | |
a50feda5 ED |
436 | bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev, |
437 | const struct in6_addr *addr) | |
1da177e4 | 438 | { |
2384d025 JB |
439 | struct net_device *nh_dev; |
440 | struct ifacaddr6 *aca; | |
a50feda5 | 441 | bool found = false; |
7562f876 | 442 | |
c6d14c84 | 443 | rcu_read_lock(); |
bb69ae04 ED |
444 | if (dev) |
445 | found = ipv6_chk_acast_dev(dev, addr); | |
1c51dc9a LR |
446 | else { |
447 | unsigned int hash = inet6_acaddr_hash(net, addr); | |
448 | ||
2384d025 JB |
449 | hlist_for_each_entry_rcu(aca, &inet6_acaddr_lst[hash], |
450 | aca_addr_lst) { | |
451 | nh_dev = fib6_info_nh_dev(aca->aca_rt); | |
452 | if (!nh_dev || !net_eq(dev_net(nh_dev), net)) | |
453 | continue; | |
454 | if (ipv6_addr_equal(&aca->aca_addr, addr)) { | |
a50feda5 | 455 | found = true; |
bb69ae04 ED |
456 | break; |
457 | } | |
2384d025 | 458 | } |
1c51dc9a | 459 | } |
c6d14c84 | 460 | rcu_read_unlock(); |
7562f876 | 461 | return found; |
1da177e4 LT |
462 | } |
463 | ||
7c90cc2d FLB |
464 | /* check if this anycast address is link-local on given interface or |
465 | * is global | |
466 | */ | |
467 | bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev, | |
468 | const struct in6_addr *addr) | |
469 | { | |
470 | return ipv6_chk_acast_addr(net, | |
471 | (ipv6_addr_type(addr) & IPV6_ADDR_LINKLOCAL ? | |
472 | dev : NULL), | |
473 | addr); | |
474 | } | |
1da177e4 LT |
475 | |
476 | #ifdef CONFIG_PROC_FS | |
477 | struct ac6_iter_state { | |
6ab57e7e | 478 | struct seq_net_private p; |
1da177e4 LT |
479 | struct net_device *dev; |
480 | struct inet6_dev *idev; | |
481 | }; | |
482 | ||
483 | #define ac6_seq_private(seq) ((struct ac6_iter_state *)(seq)->private) | |
484 | ||
485 | static inline struct ifacaddr6 *ac6_get_first(struct seq_file *seq) | |
486 | { | |
487 | struct ifacaddr6 *im = NULL; | |
488 | struct ac6_iter_state *state = ac6_seq_private(seq); | |
6ab57e7e | 489 | struct net *net = seq_file_net(seq); |
1da177e4 | 490 | |
7562f876 | 491 | state->idev = NULL; |
ce81b76a | 492 | for_each_netdev_rcu(net, state->dev) { |
1da177e4 | 493 | struct inet6_dev *idev; |
ce81b76a | 494 | idev = __in6_dev_get(state->dev); |
1da177e4 LT |
495 | if (!idev) |
496 | continue; | |
497 | read_lock_bh(&idev->lock); | |
498 | im = idev->ac_list; | |
499 | if (im) { | |
500 | state->idev = idev; | |
501 | break; | |
502 | } | |
503 | read_unlock_bh(&idev->lock); | |
504 | } | |
505 | return im; | |
506 | } | |
507 | ||
508 | static struct ifacaddr6 *ac6_get_next(struct seq_file *seq, struct ifacaddr6 *im) | |
509 | { | |
510 | struct ac6_iter_state *state = ac6_seq_private(seq); | |
511 | ||
512 | im = im->aca_next; | |
513 | while (!im) { | |
ce81b76a | 514 | if (likely(state->idev != NULL)) |
1da177e4 | 515 | read_unlock_bh(&state->idev->lock); |
ce81b76a ED |
516 | |
517 | state->dev = next_net_device_rcu(state->dev); | |
1da177e4 LT |
518 | if (!state->dev) { |
519 | state->idev = NULL; | |
520 | break; | |
521 | } | |
ce81b76a | 522 | state->idev = __in6_dev_get(state->dev); |
1da177e4 LT |
523 | if (!state->idev) |
524 | continue; | |
525 | read_lock_bh(&state->idev->lock); | |
526 | im = state->idev->ac_list; | |
527 | } | |
528 | return im; | |
529 | } | |
530 | ||
531 | static struct ifacaddr6 *ac6_get_idx(struct seq_file *seq, loff_t pos) | |
532 | { | |
533 | struct ifacaddr6 *im = ac6_get_first(seq); | |
534 | if (im) | |
535 | while (pos && (im = ac6_get_next(seq, im)) != NULL) | |
536 | --pos; | |
537 | return pos ? NULL : im; | |
538 | } | |
539 | ||
540 | static void *ac6_seq_start(struct seq_file *seq, loff_t *pos) | |
ce81b76a | 541 | __acquires(RCU) |
1da177e4 | 542 | { |
ce81b76a | 543 | rcu_read_lock(); |
1da177e4 LT |
544 | return ac6_get_idx(seq, *pos); |
545 | } | |
546 | ||
547 | static void *ac6_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
548 | { | |
ce81b76a ED |
549 | struct ifacaddr6 *im = ac6_get_next(seq, v); |
550 | ||
1da177e4 LT |
551 | ++*pos; |
552 | return im; | |
553 | } | |
554 | ||
555 | static void ac6_seq_stop(struct seq_file *seq, void *v) | |
ce81b76a | 556 | __releases(RCU) |
1da177e4 LT |
557 | { |
558 | struct ac6_iter_state *state = ac6_seq_private(seq); | |
ce81b76a | 559 | |
1da177e4 LT |
560 | if (likely(state->idev != NULL)) { |
561 | read_unlock_bh(&state->idev->lock); | |
ce81b76a | 562 | state->idev = NULL; |
1da177e4 | 563 | } |
ce81b76a | 564 | rcu_read_unlock(); |
1da177e4 LT |
565 | } |
566 | ||
567 | static int ac6_seq_show(struct seq_file *seq, void *v) | |
568 | { | |
569 | struct ifacaddr6 *im = (struct ifacaddr6 *)v; | |
570 | struct ac6_iter_state *state = ac6_seq_private(seq); | |
571 | ||
4b7a4274 | 572 | seq_printf(seq, "%-4d %-15s %pi6 %5d\n", |
1da177e4 | 573 | state->dev->ifindex, state->dev->name, |
b071195d | 574 | &im->aca_addr, im->aca_users); |
1da177e4 LT |
575 | return 0; |
576 | } | |
577 | ||
56b3d975 | 578 | static const struct seq_operations ac6_seq_ops = { |
1da177e4 LT |
579 | .start = ac6_seq_start, |
580 | .next = ac6_seq_next, | |
581 | .stop = ac6_seq_stop, | |
582 | .show = ac6_seq_show, | |
583 | }; | |
584 | ||
2c8c1e72 | 585 | int __net_init ac6_proc_init(struct net *net) |
1da177e4 | 586 | { |
c3506372 CH |
587 | if (!proc_create_net("anycast6", 0444, net->proc_net, &ac6_seq_ops, |
588 | sizeof(struct ac6_iter_state))) | |
1da177e4 LT |
589 | return -ENOMEM; |
590 | ||
591 | return 0; | |
592 | } | |
593 | ||
6ab57e7e | 594 | void ac6_proc_exit(struct net *net) |
1da177e4 | 595 | { |
ece31ffd | 596 | remove_proc_entry("anycast6", net->proc_net); |
1da177e4 | 597 | } |
6915ed86 | 598 | #endif |
2384d025 JB |
599 | |
600 | /* Init / cleanup code | |
601 | */ | |
602 | int __init ipv6_anycast_init(void) | |
603 | { | |
604 | int i; | |
605 | ||
606 | for (i = 0; i < IN6_ADDR_HSIZE; i++) | |
607 | INIT_HLIST_HEAD(&inet6_acaddr_lst[i]); | |
608 | return 0; | |
609 | } | |
610 | ||
611 | void ipv6_anycast_cleanup(void) | |
612 | { | |
613 | int i; | |
614 | ||
615 | spin_lock(&acaddr_hash_lock); | |
616 | for (i = 0; i < IN6_ADDR_HSIZE; i++) | |
617 | WARN_ON(!hlist_empty(&inet6_acaddr_lst[i])); | |
618 | spin_unlock(&acaddr_hash_lock); | |
619 | } |